Added new option 'session_timeout' for control how long we must keep idle ftp connect.
Use getint for session_timeout.
Merge pull request #14 from sirkonst/session_timeout

New option 'session_timeout'
Adds some documentation for config values in README.md

This resolves an issue brought up in #14.
Merge branch 'master' of github.com:softlayer/swftp
Fixed Typo in README.md
Adds 'sessions_per_user' option

FTP: Fixes bug where unclean disconnects will cause numclients to be collected inaccurately.
FTP/SFTP: Adds per-user concurency limit option. Clients established past the limit should be
          diconnected after the authentication step.

Resolves #15
Adds missing sessions_per_user value to sample config file
Adjusts the short description in setup.py
Merge branch 'upstream/master'

Conflicts:
	swftp/ftp/service.py
Try to fix leak.
Added debug counter for ftp_PASV and ftp_PORT.
Debug output to file.
Fixed DTP socket leaks.
Remove debug info.
Fixed DTP socket leaks.
Deny CWD to no existing path by default but added option to control it.
Fixed swftp.swift.UnAuthorized: 403 Forbidden (https://jira.selectel.org/browse/STORAGE-1167)
ignore special flags for command LIST
Overwrite response for SYST command.